Two versions of BusyBox, which should I buy?

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http://androidforums.com – I have several apps on my phone that use BusyBox, so I think I might as well just upgrade to the paid version. However, there are two popular versions on Google Play: BusyBox Pro by Stericson @ $4.99, rated 4.7/5: https://play.google.com/store/apps/details?id=stericson.busybox.donate BusyBox Installer Pro by JRummy App @ $1.99, rated 4.6/5 : https://play.google.com/store/apps/details?id=com.jrummy.busybox.install... I am not too familiar with either one or even what exactly BusyBox is, and I just want to pick one. I assume they both do the same thing, but there is a $3 difference betw (General)